JPH05312132A - Misfire detector of gasoline engine - Google Patents

Misfire detector of gasoline engine

Info

Publication number
JPH05312132A
JPH05312132A JP11779392A JP11779392A JPH05312132A JP H05312132 A JPH05312132 A JP H05312132A JP 11779392 A JP11779392 A JP 11779392A JP 11779392 A JP11779392 A JP 11779392A JP H05312132 A JPH05312132 A JP H05312132A
Authority
JP
Japan
Prior art keywords
secondary voltage
misfire
polarity
spark
ignition coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11779392A
Other languages
Japanese (ja)
Inventor
Shigeru Miyata
繁 宮田
Hideji Yoshida
秀治 吉田
Yasuo Ito
康生 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Priority to JP11779392A priority Critical patent/JPH05312132A/en
Publication of JPH05312132A publication Critical patent/JPH05312132A/en
Pending legal-status Critical Current

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  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

PURPOSE:To detect misfire accurately even when there is no discrimination between two cylinders by effectively utilizing the characteristic of secondary voltage waveforms caused by the spark discharge of reverse polarity simultaneously generated by two spark plugs connected to an ignition coil. CONSTITUTION:A misfire detector provided with a dual polarity DLI ignition device comprises a plus secondary voltage divider 5P for detecting the secondary voltage of plus polarity of an ignition coil, a minus secondary voltage divider 5M for detecting the secondary voltage of minus polarity that is synchronized with the divider 5P, a secondary voltage detection circuit 6, and a misfire judgment circuit 7 for judging misfire by analyzing the secondary voltage waveform. Misfire is judged when the damping time span of the secondary voltage of plus polarity after spark discharging, and the damping time span of the secondary voltage of minus polarity are no less than a predetermined value, or when the damping time span of one reversal value as well as the secondary voltage added to the other is no less than a predetermined value.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、点火コイルの二次回
路の両端子にそれぞれスパークプラグを接続する、いわ
ゆる両極性ディストリビュータ・レス・イグナイタ(D
LI)式点火装置付きガソリン機関において、着火ミス
(失火)を検出するための失火検出装置に関する。
BACKGROUND OF THE INVENTION The present invention relates to a so-called bipolar distributorless igniter (D) for connecting spark plugs to both terminals of a secondary circuit of an ignition coil.
TECHNICAL FIELD The present invention relates to a misfire detection device for detecting a misfire (misfire) in a gasoline engine with an LI type ignition device.

【0002】[0002]

【従来の技術】自動車エンジンの排気ガスの浄化及び燃
費向上の要求から、機関の各気筒毎に着火状態を検出
し、全ての気筒の失火防止対策ができる装置が要請され
ている。この失火検出手段として、スパークプラグの火
花放電終了の前後に昇圧する二次電圧の減衰が失火時に
は正常着火時より遅くなることを利用する方法が有利で
ある。また、両極性DLI式点火装置では、圧縮行程に
ある気筒のスパークプラグと排気行程にあるスパークプ
ラグとにおいて、ほぼ同時に逆極性の点火と捨火の火花
放電が生じる。
2. Description of the Related Art In order to purify exhaust gas of an automobile engine and improve fuel efficiency, there is a demand for an apparatus capable of detecting an ignition state of each cylinder of an engine and preventing misfire of all cylinders. As this misfire detection means, it is advantageous to use a method in which the decay of the secondary voltage boosted before and after the spark discharge of the spark plug is attenuated when the misfire is delayed compared to during the normal ignition. Further, in the bipolar DLI ignition device, sparks of opposite polarity are generated at the same time in the spark plug of the cylinder in the compression stroke and the spark plug in the exhaust stroke at the same time.

【0003】この出願人はつぎの現象を見出した。 (イ)火花放電終了後に二次電圧は昇圧して、スパーク
プラグの浮遊静電容量には数千ボルトの二次電圧が充電
され、この二次電圧は気筒内で混合気が正常に着火し、
スパークプラグの火花放電間隙に燃焼中の混合気のイオ
ンが存在する場合と、失火して前記イオンが存在しない
場合とでは、その減衰特性が顕著に相違する。すなわ
ち、失火の場合は、着火の場合と比較し、減衰時間が長
くなる。よってこの減衰特性を検出することで、機関の
各気筒ごとの失火の判別が可能である。 (ロ)両極性DLI式点火装置において、火花放電終了
後の二次電圧の減衰特性は、捨火の火花放電の場合、気
筒が排気行程にありスパークプラグの火花放電間隙付近
に燃焼中の混合気のイオンが存在しないため、上記失火
と同様に減衰時間が長くなる。
The applicant has found the following phenomenon. (B) After the spark discharge is completed, the secondary voltage is boosted, and the floating capacitance of the spark plug is charged with a secondary voltage of several thousand volts. This secondary voltage causes the air-fuel mixture to normally ignite in the cylinder. ,
The attenuation characteristics are remarkably different between the case where the ions of the air-fuel mixture during combustion are present in the spark discharge gap of the spark plug and the case where the ions are misfired and the ions are not present. That is, in the case of misfire, the decay time becomes longer than in the case of ignition. Therefore, by detecting this damping characteristic, it is possible to determine the misfire for each cylinder of the engine. (B) In the bipolar DLI ignition device, the secondary voltage decay characteristics after the spark discharge is the following: the spark discharge of the after-burning, the cylinder is in the exhaust stroke and the mixing during the spark discharge gap of the spark plug. Since there are no air ions, the decay time becomes long as in the case of misfire.

【0004】[0004]

【発明が解決しようとする課題】両極性DLI式点火装
置において、捨火の火花放電信号と、点火の火花放電信
号はほぼ同時に逆極性で発生しているため、この二つの
信号を区別するための手段が必要となる。また、これら
の信号を区別するために失火判別のための回路が複雑と
なり、この為に装置自体の大きさを大きくする必要があ
ると共にコストが高くなる欠点がある。この発明の目的
は、両極性DLI式点火装置において、1つの点火コイ
ルの両極に接続された2つのスパークプラグで、同時的
に発生する逆極性の火花放電に伴う二次電圧波形の特性
を有効に利用して、点火と捨火の2つの気筒の区別のな
い場合でも失火を正確に検出できる失火検出装置を提供
することにある。
DISCLOSURE OF THE INVENTION In a bipolar DLI ignition device, since a spark discharge signal for a fire and a spark discharge signal for an ignition are generated almost simultaneously with opposite polarities, the two signals are distinguished from each other. Means are required. Further, in order to distinguish these signals, the circuit for misfire discrimination becomes complicated, which necessitates an increase in the size of the device itself and also increases the cost. An object of the present invention is to make effective the characteristics of a secondary voltage waveform associated with spark discharges of opposite polarities that occur simultaneously in two spark plugs connected to both poles of one ignition coil in a bipolar DLI ignition device. It is intended to provide a misfire detection device which can accurately detect misfire even when there is no distinction between the two cylinders of ignition and disuse.

【0005】[0005]

【課題を解決するための手段】この発明の失火検出装置
は、両極性DLI式点火装置付きガソリン機関の失火検
出装置において、1つの点火コイルのプラス極性の二次
電圧が印加されるスパークプラグの火花放電終了後の二
次電圧を検出するプラス二次電圧センサと、マイナス極
性の二次電圧が印加されるスパークプラグの火花放電終
了後の二次電圧を検出するマイナス二次電圧センサと、
これら各センサに接続された二次電圧検出回路と、該二
次電圧検出回路により検出された二次電圧波形を解析し
て失火を判別する判別回路とを備え、前記火花放電終了
後のプラス極性の二次電圧の減衰時間とマイナス極性の
二次電圧の減衰時間とが、共に所定値以上のとき失火し
たと判別する。請求項2に記載の失火検出装置は、火花
放電終了後のプラス極性の二次電圧とマイナス極性の二
次電圧を反転した反転二次電圧とを加算し、加算された
前記火花放電終了後の二次電圧の加算値の減衰時間が設
定時間以上のとき失火したと判別する。
DISCLOSURE OF THE INVENTION A misfire detecting device of the present invention is a misfire detecting device for a gasoline engine equipped with a bipolar DLI ignition device, and is used for a spark plug to which a positive voltage secondary voltage of one ignition coil is applied. A plus secondary voltage sensor that detects the secondary voltage after the end of the spark discharge, and a minus secondary voltage sensor that detects the secondary voltage after the end of the spark discharge of the spark plug to which the secondary voltage of the negative polarity is applied,
A secondary voltage detection circuit connected to each of these sensors, and a determination circuit that analyzes the secondary voltage waveform detected by the secondary voltage detection circuit to determine misfire, and has a positive polarity after the spark discharge is completed. When both the decay time of the secondary voltage and the decay time of the negative polarity secondary voltage are equal to or more than a predetermined value, it is determined that the misfire has occurred. The misfire detection device according to claim 2 adds a secondary voltage having a positive polarity and an inverted secondary voltage obtained by inverting a secondary voltage having a negative polarity after the end of the spark discharge, and adds the added secondary voltage after the spark discharge. When the decay time of the added value of the secondary voltage is longer than the set time, it is determined that a misfire has occurred.

【0006】[0006]

【発明の作用及び効果】請求項1に記載の発明では、1
つの点火コイルの二次電圧端子の両端子に接続されたス
パークプラグにおいて、同期して発生する点火の火花放
電終了後の二次電圧減衰特性と、捨火の火花放電終了後
の二次電圧減衰特性を検出して、これらの減衰時間が共
に設定時間以上のときを失火としている。請求項2に記
載の発明では、同期して発生する点火の火花放電の終了
後の二次電圧と、捨火の火花放電終了後の二次電圧を検
出して、これらの一方を反転して他方に加算し、加算二
次電圧波形の減衰時間が設定値以上のとき失火したと判
別する。これらにより、点火と捨火の2つの気筒の区別
のない場合でも正確な失火の有無の判別が可能となる。
According to the invention described in claim 1, 1
Characteristics of secondary voltage decay after spark spark discharge of synchronously generated spark sparks connected to both secondary voltage terminals of one ignition coil and secondary voltage decay after spark discharge Misfire is detected when the characteristics are detected and both of these decay times are equal to or longer than the set time. According to the second aspect of the present invention, the secondary voltage after the end of the spark discharge of ignition and the secondary voltage after the end of the spark discharge of synchronous discharge are detected, and one of these is inverted. When the decay time of the added secondary voltage waveform is equal to or longer than the set value, it is determined that the misfire has occurred. As a result, it is possible to accurately determine the presence or absence of misfire even when there is no distinction between the two cylinders of ignition and disuse.

【0007】[0007]

【実施例】図1は、4気筒ガソリン機関に装着された両
極性DLI式点火装置を示し、二次回路の両端が二次電
圧端子となっている2つの点火コイル1及び2を有す
る。点火コイル1には、そのプラス極性及びマイナス極
性の各二次電圧端子に、機関の第1気筒及び第3気筒に
装着されたスパークプラグ11及び12が接続されてい
る。点火コイル2には、プラス極性及びマイナス極性の
各二次電圧端子に、機関の第2気筒及び第4気筒に装着
されたスパークプラグ21及び22が接続されている。
1 shows a bipolar DLI type ignition device mounted on a 4-cylinder gasoline engine, which has two ignition coils 1 and 2 having secondary voltage terminals at both ends of a secondary circuit. Spark plugs 11 and 12 mounted on the first cylinder and the third cylinder of the engine are connected to the positive voltage and negative polarity secondary voltage terminals of the ignition coil 1, respectively. Spark plugs 21 and 22 mounted on the second cylinder and the fourth cylinder of the engine are connected to the ignition coil 2 at secondary voltage terminals of positive polarity and negative polarity, respectively.

【0008】点火コイル1及び2の各一次回路L1は、
車載電源Vと一次電流断続手段4とが接続され、各二次
回路L2は、一方の端子にダイオードDを介してスパー
クプラグ12、22が接続されると共に、他方の端子に
ダイオードDを介してスパークプラグ11、21が接続
されている。各スパークプラグ11〜22に二次電圧を
供給する高圧コード(二次回路)には、二次電圧波形を
検出する検出部としての分圧器5と、該分圧器5により
二次電圧波形を検出する二次電圧検出回路6、該二次電
圧波形を解析し、失火の有無を判別する失火判別回路7
とが接続されている。
Each primary circuit L1 of the ignition coils 1 and 2 is
The on-vehicle power supply V and the primary current interrupting means 4 are connected, and each of the secondary circuits L2 has the spark plugs 12 and 22 connected to one terminal via the diode D and the other terminal via the diode D. The spark plugs 11 and 21 are connected. In the high voltage cord (secondary circuit) that supplies the secondary voltage to each of the spark plugs 11 to 22, a voltage divider 5 as a detection unit that detects the secondary voltage waveform, and the voltage divider 5 detects the secondary voltage waveform. A secondary voltage detection circuit 6, and a misfire determination circuit 7 that analyzes the secondary voltage waveform and determines whether or not there is a misfire.
And are connected.

【0009】一次電流断続手段4は、スイッチング素子
41及びシグナルジェネレータ42からなり、エンジン
のクランク角及びスロットル開度の検出手段が付設され
たエンジンコントロールユニットECUにより制御され
て、火花放電時期がエンジンの負荷及び回転速度に適応
した点火進角となるよう点火コイル1、2の一次電流を
断続する。分圧器5は、プラス二次電圧分圧器5Pとマ
イナス二次電圧分圧器5Mとからなる。分圧器5P及び
5Mは、いずれも点火コイル1及び2のプラス極性の二
次回路L2に近接して配された高インピーダンス素子5
1と、該素子51とアースとの間に接続した低インピー
ダンス素子52とを有する。
The primary current interrupting means 4 comprises a switching element 41 and a signal generator 42, and is controlled by an engine control unit ECU provided with means for detecting the crank angle and throttle opening of the engine, so that the spark discharge timing of the engine. The primary currents of the ignition coils 1 and 2 are interrupted so that the ignition advance angle is adapted to the load and the rotation speed. The voltage divider 5 includes a plus secondary voltage divider 5P and a minus secondary voltage divider 5M. The voltage dividers 5P and 5M are both high-impedance elements 5 arranged close to the positive polarity secondary circuit L2 of the ignition coils 1 and 2.
1 and a low impedance element 52 connected between the element 51 and ground.

【0010】この実施例では、それぞれ高インピーダン
ス素子51は、二次回路L2の各高圧コードとの間に1
pF(ピコファラッド)静電容量を生じるよう配設され
た導電体からなり、低インピーダンス素子52は300
0pFの静電容量のコンデンサを用い、分圧器5P、5
Mは、二次回路L2に生じた二次電圧を1/3000程
度に分圧する。また低インピーダンス素子52には時定
数を数ミリ秒に設定するための抵抗53と、火花放電開
始前にコンデンサ(52)の充電電荷を瞬間に放電(リ
セット)するためのトランジスタ54とが、それぞれ並
列接続されている。
In this embodiment, each high impedance element 51 is connected between each high voltage cord of the secondary circuit L2 and
The low impedance element 52 is made of a conductor arranged so as to generate pF (picofarad) capacitance,
The voltage divider 5P, 5
M divides the secondary voltage generated in the secondary circuit L2 into about 1/3000. Further, the low impedance element 52 includes a resistor 53 for setting the time constant to several milliseconds and a transistor 54 for instantaneously discharging (resetting) the charged electric charge of the capacitor (52) before starting spark discharge. It is connected in parallel.

【0011】請求項1に記載の発明では、二次電圧検出
回路6は、前記分圧器5P、5Mに接続されたプラス二
次電圧検出回路6P及びマイナス二次電圧検出回路6M
からなる。検出回路6P及び6Mは、いずれも増幅器6
1P、反転増幅器61M、ピークホールド回路62、該
ピークホールド回路62のピークホールド値を分圧して
基準電圧とする分圧回路63、前記増幅器61Pおよび
反転増幅器61Mの出力及び基準電圧を入力とする比較
器64とからなる。
According to the first aspect of the invention, the secondary voltage detection circuit 6 includes a plus secondary voltage detection circuit 6P and a minus secondary voltage detection circuit 6M connected to the voltage dividers 5P and 5M.
Consists of. The detection circuits 6P and 6M are both amplifiers 6
1P, an inverting amplifier 61M, a peak hold circuit 62, a voltage dividing circuit 63 that divides a peak hold value of the peak hold circuit 62 to form a reference voltage, a comparison that uses the outputs of the amplifier 61P and the inverting amplifier 61M and the reference voltage as inputs. And a container 64.

【0012】二次電圧検出回路6は、ピークホールド回
路62が、シグナルジェネレータ42によりパワートラ
ンジスタのオフ時にリセットされ、火花放電終了後に二
次電圧のピーク値をホールドして、該二次電圧がたとえ
ばピーク値の1/2のレベルまで降下する時間を減衰時
間として出力する。失火判別回路7は、点火及び捨火の
火花放電終了前後のピーク電圧の減衰時間を入力するア
ンド回路71を有し、アンド回路71の出力パルスが設
定値以上のとき失火と判別する。
In the secondary voltage detection circuit 6, the peak hold circuit 62 is reset by the signal generator 42 when the power transistor is off, and holds the peak value of the secondary voltage after the spark discharge is completed, and the secondary voltage is, for example, The time to fall to half the peak value is output as the decay time. The misfire discrimination circuit 7 has an AND circuit 71 for inputting the decay time of the peak voltage before and after the end of spark discharge of ignition and fire, and discriminates a misfire when the output pulse of the AND circuit 71 is a set value or more.

【0013】請求項1に記載の失火検出装置の作用を図
2と共に説明する。シグナルジェネレータ42で点火コ
イル1、2の一次電流を断続させるパルス信号を出力
し、に示すパルス状の一次電流を各点火コイル1及び
2の一次回路L1に生じさせる。はシグナルジェネレ
ータ42により火花放電の直前に発せられるリセットパ
ルス信号である。これにより第1気筒♯1〜第4気筒♯
4に装着されているスパークプラグ11、21、12、
22には、に示す波形の二次電圧が印加される。すな
わち、点火の火花放電波形Aは、容量放電時の短く高い
電圧波形A1 に続いて誘導放電によるなだらかな波形A
2 が持続し、火花放電の終了にちかづくと二次電圧が上
昇して山状のピーク電圧(二次電圧)A3 が発生する。
The operation of the misfire detection device according to claim 1 will be described with reference to FIG. The signal generator 42 outputs a pulse signal for connecting and disconnecting the primary currents of the ignition coils 1 and 2 to generate a pulsed primary current shown in the primary circuits L1 of the ignition coils 1 and 2. Is a reset pulse signal generated by the signal generator 42 immediately before the spark discharge. As a result, the first cylinder # 1 to the fourth cylinder #
4, the spark plugs 11, 21, 12,
The secondary voltage having the waveform shown in 22 is applied to 22. That is, the ignition spark discharge waveform A is a short and high voltage waveform A1 during capacitive discharge, followed by a gentle waveform A due to inductive discharge.
2 continues, and the secondary voltage rises after the end of the spark discharge, and a peak voltage (secondary voltage) A3 is generated.

【0014】また、捨火の火花放電波形Bは、に示す
如く、点火の火花放電波形の1/2程度のレベルである
が、点火の火花放電波形Aに比較し、火花放電終了後の
二次電圧(ピーク電圧)の減衰時間が長い。これは、捨
火側では排気行程にあり、スパークプラグの火花放電間
隙にイオンが存在しないことによる。すなわち、捨火側
では、常に点火側気筒のスパークプラグにおいて失火が
発生した場合と同様に二次電圧の減衰時間が長い。よっ
て二次電圧検出回路6の出力は、プラス側とマイナス側
で、に示す如くパルス波形となる。失火判別回路7
は、加算波形及びのパルスをアンド回路71でに
示すパルスに変換し、パルスの幅が設定値以上のとき失
火と判定する。
Further, the spark discharge waveform B of the scrapping fire has a level of about 1/2 of the spark discharge waveform of the ignition as shown in, The decay time of the next voltage (peak voltage) is long. This is because the exhaust side is on the exhaust side and there are no ions in the spark discharge gap of the spark plug. That is, on the waste side, the secondary voltage decay time is always long, as in the case where misfire occurs in the spark plug of the ignition side cylinder. Therefore, the output of the secondary voltage detection circuit 6 has a pulse waveform on the plus side and the minus side as indicated by. Misfire discrimination circuit 7
Converts the added waveform and the pulse into a pulse indicated by the AND circuit 71, and determines that the misfire occurs when the pulse width is equal to or larger than the set value.

【0015】請求項2に記載の失火検出装置を図3及び
図4と共に説明する。この発明では、図3に示す如く、
二次電圧検出回路6は、分圧器5Pの入力を増幅し、こ
れと同期した分圧器5Mの入力を反転増幅器61Mで反
転増幅して加算器65で加算し、ピークホールド回路6
2及び比較器64に入力する。すなわち、分圧器5Pの
出力波形と分圧器5Mの出力波形の反転波形とを加
算し、この加算値を上記と同様ピークホールドして、
加算された火花放電終了前後の電圧がピーク値の、たと
えば1/2のレベルまでの減衰時間をに示すパルスと
して出力し、失火判別回路7は運転条件に応じて予め測
定又は計算したデータと比較して減衰時間が設定値以上
のとき失火と判別する。
The misfire detection device according to claim 2 will be described with reference to FIGS. 3 and 4. In this invention, as shown in FIG.
The secondary voltage detection circuit 6 amplifies the input of the voltage divider 5P, inverts and amplifies the input of the voltage divider 5M synchronized with this with the inverting amplifier 61M, adds it with the adder 65, and adds it to the peak hold circuit 6
2 and the comparator 64. That is, the output waveform of the voltage divider 5P and the inverted waveform of the output waveform of the voltage divider 5M are added, and the added value is peak-held in the same manner as above,
The added voltage before and after the end of the spark discharge is output as a pulse indicating the decay time of the peak value, for example, to the level of 1/2, and the misfire determination circuit 7 compares it with the data measured or calculated in advance according to the operating conditions. Then, when the decay time is equal to or longer than the set value, it is determined as misfire.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の失火検出装置を装着したガソリン機
関の点火回路図である。
FIG. 1 is an ignition circuit diagram of a gasoline engine equipped with a misfire detection device of the present invention.

【図2】失火検出装置の作動説明のための波形図であ
る。
FIG. 2 is a waveform diagram for explaining the operation of the misfire detection device.

【図3】請求項2の失火検出装置を装着したガソリン機
関の点火回路図である。
FIG. 3 is an ignition circuit diagram of a gasoline engine equipped with the misfire detection device of claim 2.

【図4】失火検出装置の作動説明のための波形図であ
る。
FIG. 4 is a waveform diagram for explaining the operation of the misfire detection device.

【符号の説明】[Explanation of symbols]

1、2 点火コイル 11、12、21、22 スパークプラグ 4 一次電流断続手段 5、5P、5M 分圧器(二次電圧センサ) 6、6P、6M 二次電圧検出回路 7 失火判別回路 1, 2 Ignition coil 11, 12, 21, 22 Spark plug 4 Primary current interrupting means 5, 5P, 5M voltage divider (secondary voltage sensor) 6, 6P, 6M Secondary voltage detection circuit 7 Misfire determination circuit

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 点火コイルと、その一次電流断続手段
と、前記点火コイルの二次回路の両端子に接続されたス
パークプラグとを備えるディストリビュータ・レス・イ
グナイタ式点火装置付きガソリン機関の失火検出装置で
あって、 1つの点火コイルのプラス極性の二次電圧が印加される
スパークプラグの火花放電終了後の二次電圧を検出する
プラス二次電圧センサと、マイナス極性の二次電圧が印
加されるスパークプラグの火花放電終了後の二次電圧を
検出するマイナス二次電圧センサと、これら各センサに
接続された二次電圧検出回路と、該二次電圧検出回路に
より検出された二次電圧波形を解析して失火を判別する
判別回路とを備え、 前記火花放電終了後のプラス極性の二次電圧の減衰時間
とマイナス極性の二次電圧の減衰時間とが、共に所定値
以上のとき失火したと判別することを特徴とするガソリ
ン機関の失火検出装置。
1. A misfire detection device for a gasoline engine with a distributorless igniter ignition device, comprising an ignition coil, a primary current interrupting means for the ignition coil, and a spark plug connected to both terminals of a secondary circuit of the ignition coil. And a plus secondary voltage sensor for detecting the secondary voltage after the spark discharge of the spark plug to which the secondary voltage of one polarity of the plus polarity of the ignition coil is applied, and a secondary voltage of the minus polarity are applied. A negative secondary voltage sensor that detects the secondary voltage after the spark discharge of the spark plug, a secondary voltage detection circuit connected to each of these sensors, and a secondary voltage waveform detected by the secondary voltage detection circuit. And a determination circuit for determining a misfire by analyzing, wherein the decay time of the positive polarity secondary voltage and the decay time of the negative polarity secondary voltage after completion of the spark discharge are Misfire detecting apparatus for a gasoline engine, characterized in that to determine that misfire when the predetermined value or more.
【請求項2】 点火コイルと、その一次電流断続手段
と、前記点火コイルの二次回路の両端子に接続されたス
パークプラグとを備えるディストリビュータ・レス・イ
グナイタ式点火装置付きガソリン機関の失火検出装置で
あって、 1つの点火コイルのプラス極性の二次電圧が印加される
スパークプラグの火花放電終了後の二次電圧を検出する
プラス二次電圧センサと、マイナス極性の二次電圧が印
加されるスパークプラグの火花放電終了後の二次電圧を
検出するマイナス二次電圧センサと、これら各センサに
接続された二次電圧検出回路と、該二次電圧検出回路に
より検出された二次電圧波形を解析して失火を判別する
判別回路とを備え、 前記火花放電終了後のプラス極性の二次電圧とマイナス
極性の二次電圧を反転した反転二次電圧とを加算し、加
算された前記火花放電終了後の二次電圧の加算値の減衰
時間が設定時間以上のとき失火したと判別することを特
徴とするガソリン機関の失火検出装置。
2. A misfire detection device for a gasoline engine with a distributorless igniter type ignition device, comprising an ignition coil, a primary current interrupting means for the ignition coil, and a spark plug connected to both terminals of a secondary circuit of the ignition coil. And a plus secondary voltage sensor for detecting the secondary voltage after the spark discharge of the spark plug to which the secondary voltage of one polarity of the plus polarity of the ignition coil is applied, and a secondary voltage of the minus polarity are applied. A negative secondary voltage sensor that detects the secondary voltage after the spark discharge of the spark plug, a secondary voltage detection circuit connected to each of these sensors, and a secondary voltage waveform detected by the secondary voltage detection circuit. And a secondary circuit having a positive polarity secondary voltage after completion of the spark discharge and an inverted secondary voltage obtained by inverting the negative polarity secondary voltage. And misfire detecting device of a gasoline engine, characterized in that to determine the decay time of the sum of the summed the spark discharge after the end of the secondary voltage is misfiring when the set time or longer.
JP11779392A 1992-05-11 1992-05-11 Misfire detector of gasoline engine Pending JPH05312132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11779392A JPH05312132A (en) 1992-05-11 1992-05-11 Misfire detector of gasoline engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11779392A JPH05312132A (en) 1992-05-11 1992-05-11 Misfire detector of gasoline engine

Publications (1)

Publication Number Publication Date
JPH05312132A true JPH05312132A (en) 1993-11-22

Family

ID=14720435

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11779392A Pending JPH05312132A (en) 1992-05-11 1992-05-11 Misfire detector of gasoline engine

Country Status (1)

Country Link
JP (1) JPH05312132A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100342174B1 (en) * 2000-06-30 2002-07-02 이준영 Method of recognition for cylinder number of D.L.I engine system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100342174B1 (en) * 2000-06-30 2002-07-02 이준영 Method of recognition for cylinder number of D.L.I engine system

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